Question

Your friend decides to decrease cooking time for spaghetti noodles by adding table salt to 2.0 L water. How much table salt (NaCl) must be added to the water in order to raise the boiling point by 4.0 °C? (Kf = 1.86 °C/m, Kp = 0.512 °C/m, Na: 23, Cl: 35.5 g/mol) A-) 215 grams B-) 3.9 grams C-) 8.0 grams D-) 457 grams E-) 4.0 grams

Answer 1

Suppone ny Nach Salt Added Molar mars of Nach 58.44 g/mole mole of Nach N 58.44 mole kg g water used 2 kg N Molality m. Mole of Nach kg of water 58.44x2 Von't hoft factor for Nach ~ Nat t ce ATO 4.0 oC ATG i.m.kb 2x x ois12 58.44 X2 M 456.5625 g Ins7 g option [o] is correct